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Power transmission line fault location method based on line parameters and relay protection device

A transmission line and fault location technology, applied in the field of high-voltage power transmission, can solve problems such as fault location deviation, and achieve the effects of eliminating fault location errors, reducing workload, and improving sensitivity and reliability.

Inactive Publication Date: 2016-01-06
SOUTHEAST UNIV
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Problems solved by technology

The existing single-ended ranging algorithm and double-ended ranging algorithm assume that the line parameters are uniform without exception, and calculate on this basis, but in practice, the asymmetry of the line parameters caused by the hybrid line will make the calculated fault great deviation in position

Method used

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  • Power transmission line fault location method based on line parameters and relay protection device
  • Power transmission line fault location method based on line parameters and relay protection device
  • Power transmission line fault location method based on line parameters and relay protection device

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Embodiment Construction

[0018] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0019] The inventive idea of ​​the present invention is: based on the "cable-overhead-cable" hybrid segment line parameter model, the existing fault location method based on line parameters (including single-end ranging method and double-end ranging method) is improved to eliminate It is the error caused by the asymmetry of the line parameters. The invention is mainly applied to the relay protection device, which can effectively solve the error problem caused by the neglect of line parameters in the fault ranging algorithm of the existing relay protection device, and greatly improve the sensitivity and reliability of the relay protection device. Among them, the "cable-overhead-cable" hybrid segmented line parameter model divides the transmission line into cables L at both ends 1 Segment, cable L 2 Segment and intermediate overhead line L 3 section, L...

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Abstract

The invention discloses a power transmission line fault location method based on line parameters, and belongs to the technical field of high-voltage power transmission. According to the fault location method of the invention, fault location is conducted based on the electric parameters of a single side or double sides of a power transmission line, a 'cable-overhead-cable' hybrid segmented line parameter model is used in fault location, the 'cable-overhead-cable' hybrid segmented line parameter model divides the transmission line into a cable segment L1 and a cable segment L2 at the two ends and an overhead line segment L3 in the middle, and L1, L2 and L3 are of lengths of corresponding segmented lines. The invention further discloses a fault location module of a relay protection device. Fault location error caused by line parameter asymmetry can be effectively eliminated. After the method is applied to the relay protection device, the sensitivity and reliability of the relay protection device can be improved. A faulty site can be located accurately, and the workload of the transmission line maintenance staff can be reduced.

Description

technical field [0001] The invention relates to a transmission line fault location method, in particular to a transmission line fault location method based on line parameters, and belongs to the technical field of high voltage transmission. Background technique [0002] With the rapid development of my country's power industry, the pattern of modern power grids is changing with each passing day, and high-voltage transmission plays an increasingly important role in the power grid. In recent years, the forms of high-voltage transmission lines tend to be diversified, and the proportion of "cable-overhead" hybrid lines has increased, which is quite different from the traditional transmission line model. The asymmetry of line parameters will affect the current mainstream. The distance measurement principle of the protection device causes a certain error. The fault location devices in the existing relay protection equipment all believe that the line parameters are uniform, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCY04S10/52
Inventor 王玉荣陈昊沙金龙蒋书鹤谭风雷
Owner SOUTHEAST UNIV
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